A combination of 11 images - 1@3min; 1@4min; 3@6min; 3@8min; 2@10min; 1@15min - totaling 84 min at ISO800. No darks, no flats.
Raw processing in Canon's ZoomBrowser Raw Image Processor; DDP in ImagesPlus; Aligned and Average Combined in Registar.
(20051203_Horsehead_Comb1-Avg-tp+.jpg)